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Old 03-12-2016, 11:30 AM   #11
Senior Member
Join Date: Apr 2012
Location: White Bear Lake
Posts: 409
The basic math behind it is Ohm's law:

Volts x amps = watts

So 12v*200amps = 2400 watts
or 6v*200amps = 1200 watts

So the overall energy for a 6v is 1/2 that of a 12 volt. Two 6v would get you to 2400 watts, same as the example 12v.

BUT - usually pairs of cheaper "golf cart" batteries have higher amps than many 12 volt batteries. And they can be discharged deeper.
So it becomes a game of balancing cost, capacity, available space, and weight.

In my case, two 6v gave me more capacity than what I could fit in the available space with one big, or two small, 12 volts. And they were a bit cheaper.

Some people go with 2 or 4 6v, some are happy with 1 or 2 12v. Depends on your priorities for the 4 selection criteria listed above.

2012 Ford F-150 Eco, SCrew, 4x4, MaxTow, HD Payload
SOB, used to be:Jayco 26.5 RLS
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Old 03-12-2016, 12:35 PM   #12
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Join Date: Dec 2015
Location: Riverside
Posts: 27
27TMH 12VDC 117AHs Cap 175 Minutes @25AMPS (2.9Hrs) 47LBS
two connected in parallel gives you this...
The Trojan 27TMH battery is actually rated at 200 min at 25 amps and weighs 61 lbs. However, this rating is not representative of the actual loading on an RV battery. The normal load on an RV battery is much lower than 25 amp and is intermittent in nature. Therefore the kWh rating is a much better guide to use. As for being confusing, how many post do you see that people erroneously assume that when you connect two 6v batteries you double the amp hrs. This does not happen if you use kWh.

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